well, its about an inch to inch and half low at 15 yards. It shoots a consistent group, just low. I could certainly try to use the top of the front sight and that probably would compensate plenty. As far as familiarity goes, I have been shooting almost my entire 28 years as of age 4 or so. I know how proper sight picture and such. Not a problem you asking though, how would you have known? no problem. Think I will try this method.
Ammo is kinda a pain right now in selecting an ammo and keeping with that ammo. I'm kinda in a "whatever I can find" stage right now, haha. I also shoot Blazer Brass at the range but keep Winchester SXZ loaded at the house. I've found myself carrying the .45 anyhow but still want the house gun to be good to go in every and all situations.
The Taurus 24/7 is not a target gun, it's a fighting gun. As such, you should not expect it to shoot POA/POI exactly. 1-1/2" low at 15 yrds would be 1/2-3/4" low at 7 yrds and that range is going to be further than you'll ever have to use the gun defensively in all but the rare exception.
Think keeping all your rounds inside that magic 8" circle combatively. That's the average size of a humans head. Place that 8" requirement centered on a persons chest and you'll usually get the results you are looking for in a gunfight.
Now if we look at the 8" circle and your groups were 1-1 1/2" low from your POA, you still have at least 2 1/2" below that POA to stay inside the 8" circle. Quite acceptable for combat accuracy under stress with a gun that's not designed to be a super accurate target gun to begin with.
I'd think about increasing your speed on threat staying within the 8" circle with multiple hits instead of worrying about the gun shooting minimally low from POA at 15 yrds. When you can get 3-4 rds inside that 8" circle in 1.5 seconds from 15 yrds, move it up a notch and shoot 7 yrds with 3-4 rds on threat inside that 8" circle in 1 second. When you can get to that level, now do the same thing one handed, and when you get to that level, move it up a notch and go for 3-4 rds on threat inside that circle one handed from 4 yrds while moving.
Get to that level, the POA/POI you are worried about will be a non issue in a gunfight.